#include "reg51.h"

#define LED P0_0
#define ADDR0 P1_0
#define ADDR1 P1_1
#define ADDR2 P1_2
#define ADDR3 P1_3
#define ENABLE_LED P1_4

int main() {
    ENABLE_LED = 0;
    ADDR3 = 1;
    ADDR2 = 1;
    ADDR1 = 1;
    ADDR0 = 0;

    LED = 0;
    while (1);
}